A pulse position modulated laser communications system

https://calhoun.nps.edu/bitstream/10945/16321/1/pulsepositionmod00crai.pdf

This paper, an introduction to this first Special Issue on Optical Communications, follows some of the arguments that have prevailed for and against optics as a viable communications medium for terrestrial and space applications, and assesses the present state of the art of optics devices, systems, and theory, based on discussions with scientists and engineers who have been specializing in the optical field. It also attempts in a small way to give some appreciation of the special problems the traditional communications engineer faces in readjusting his thinking and his "physical intuition" in going from the world of electrons to the world of photons.

Optical communications&#8212;A decade of preparations

Using a decaying step approximation of signal waveforms, a new method of coding messages with 1/0 pulses having varying intervals only has been developed The quantising noise in the received message has been reduced considerably by making the coder self-oscillating, thus giving rise to an asynchronous system having properties similar to those of the familiar ppm and pfm systems

Pulse-interval modulation

Operating over a frequency range from audio to ultraviolet, the modern laser may be the most widely applicable active device at the disposal of today's engineer, enabling him to generate, amplify, modulate, transmit, and detect signals at frequencies more than 10000 times higher than was previously possible. Yet despite the almost unlimited potential for new and exotic applications offered by these shorter wavelengths, innovations have not lived up to their rave notices. Reasons for this relative inertia vary according to the application intended but, in general, it can be predicted that progress in the laser art will accelerate with the improvement of laser efficiency, development of auxiliary systems, and an updating of engineering thinking in terms of finding the ``problems'' that lasers can solve. This first article in a series deals with the laser devices themselves?their advantages and their deficiencies?and will summarize what is happening in the laser art today. Other parts, scheduled to appear in future issues of IEEE SPECTRUM, will cover applications in materials processing, instrumentation and measurement, optical communication, medicine, holography, data processing and storage, displays, and safety.

A pulse position modulated laser communications system

References

Optical communications—A decade of preparations

Pulse-interval modulation

The family of lasers: a survey

WHAT's AHEAD FOR OPTICAL COMMUNICATION?

Related Papers (5)

Time division system for modulated pulse transmission

Dual Pulse-Pulse Interval Modulation for Optical Wireless Communications

Pulse source based on directly modulated laser and phase modulator

Dynamics of mode-locked lasers: A statistical model and experimental results

Ultrashort pulse laser generation device

A pulse position modulated laser communications system

References

Optical communications&#8212;A decade of preparations

Pulse-interval modulation

The family of lasers: a survey

WHAT's AHEAD FOR OPTICAL COMMUNICATION?

Related Papers (5)

Time division system for modulated pulse transmission

Dual Pulse-Pulse Interval Modulation for Optical Wireless Communications

Pulse source based on directly modulated laser and phase modulator

Dynamics of mode-locked lasers: A statistical model and experimental results

Ultrashort pulse laser generation device

Optical communications—A decade of preparations